Commit | Line | Data |
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f5a868d6 SL |
1 | /* if_pcl.c 4.1 83/03/31 */ |
2 | ||
3 | #include "pcl.h" | |
4 | #if NPCL > 0 | |
5 | /* | |
6 | * DEC CSS PCL-11B Parallel Communications Interface | |
7 | * | |
8 | * Written by Mike Muuss. | |
9 | */ | |
10 | #include "../machine/pte.h" | |
11 | ||
12 | #include "../h/param.h" | |
13 | #include "../h/systm.h" | |
14 | #include "../h/mbuf.h" | |
15 | #include "../h/buf.h" | |
16 | #include "../h/protosw.h" | |
17 | #include "../h/socket.h" | |
18 | #include "../h/vmmac.h" | |
19 | #include "../h/errno.h" | |
20 | ||
21 | #include "../net/if.h" | |
22 | #include "../net/netisr.h" | |
23 | #include "../net/route.h" | |
24 | #include "../netinet/in.h" | |
25 | #include "../netinet/in_systm.h" | |
26 | #include "../netinet/ip.h" | |
27 | #include "../netinet/ip_var.h" | |
28 | ||
29 | #include "../vax/cpu.h" | |
30 | #include "../vax/mtpr.h" | |
31 | #include "../vaxif/if_pclreg.h" | |
32 | #include "../vaxif/if_uba.h" | |
33 | #include "../vaxuba/ubareg.h" | |
34 | #include "../vaxuba/ubavar.h" | |
35 | ||
36 | /* The MTU has been carefully selected to prevent fragmentation <-> ArpaNet */ | |
37 | #define PCLMTU (1006) /* Max transmission unit (bytes) */ | |
38 | ||
39 | int pclprobe(), pclattach(), pclrint(), pclxint(); | |
40 | int pclinit(),pcloutput(),pclreset(); | |
41 | ||
42 | struct uba_device *pclinfo[NPCL]; | |
43 | u_short pclstd[] = { 0 }; | |
44 | #define PCLUNIT(x) minor(x) | |
45 | struct uba_driver pcldriver = | |
46 | { pclprobe, 0, pclattach, 0, pclstd, "pcl", pclinfo }; | |
47 | ||
48 | /* | |
49 | * PCL software status per interface. | |
50 | * | |
51 | * Each interface is referenced by a network interface structure, | |
52 | * sc_if, which the routing code uses to locate the interface. | |
53 | * This structure contains the output queue for the interface, its address, ... | |
54 | * We also have, for each interface, a UBA interface structure, which | |
55 | * contains information about the UNIBUS resources held by the interface: | |
56 | * map registers, buffered data paths, etc. Information is cached in this | |
57 | * structure for use by the if_uba.c routines in running the interface | |
58 | * efficiently. | |
59 | */ | |
60 | struct pcl_softc { | |
61 | struct ifnet sc_if; /* network-visible interface */ | |
62 | struct ifuba sc_ifuba; /* UNIBUS resources */ | |
63 | short sc_oactive; /* is output active? */ | |
64 | short sc_olen; /* length of last output */ | |
65 | short sc_lastdest; /* previous destination */ | |
66 | short sc_odest; /* current xmit destination */ | |
67 | short sc_pattern; /* identification pattern */ | |
68 | } pcl_softc[NPCL]; | |
69 | ||
70 | /* | |
71 | * Structure of "local header", which only goes between | |
72 | * pcloutput and pclstart. | |
73 | */ | |
74 | struct pcl_header { | |
75 | short pcl_dest; /* Destination PCL station */ | |
76 | }; | |
77 | ||
78 | /* | |
79 | * Do non-DMA output of 1 word to determine presence of interface, | |
80 | * and to find the interupt vector. 1 word messages are a special | |
81 | * case in the receiver routine, and will be discarded. | |
82 | */ | |
83 | pclprobe(reg) | |
84 | caddr_t reg; | |
85 | { | |
86 | register int br, cvec; /* r11, r10 value-result */ | |
87 | register struct pcldevice *addr = (struct pcldevice *)reg; | |
88 | ||
89 | #ifdef lint | |
90 | br = 0; cvec = br; br = cvec; | |
91 | pclrint(0); pclxint(0); | |
92 | #endif | |
93 | addr->pcl_rcr = PCL_RCINIT; | |
94 | addr->pcl_tcr = PCL_TXINIT; | |
95 | addr->pcl_tsba = 0xFFFE; | |
96 | /* going for 01777776 */ | |
97 | addr->pcl_tsbc = -4; /* really short */ | |
98 | addr->pcl_tcr = | |
99 | ((1 & 0xF) << 8) | PCL_TXNPR | PCL_SNDWD | PCL_STTXM | PCL_IE | 0x0030; | |
100 | DELAY(100000); | |
101 | addr->pcl_tcr = PCL_TXINIT; | |
102 | return (sizeof (struct pcldevice)); | |
103 | } | |
104 | ||
105 | /* | |
106 | * Interface exists: make available by filling in network interface | |
107 | * record. System will initialize the interface when it is ready | |
108 | * to accept packets. | |
109 | */ | |
110 | pclattach(ui) | |
111 | struct uba_device *ui; | |
112 | { | |
113 | register struct pcl_softc *sc = &pcl_softc[ui->ui_unit]; | |
114 | register struct sockaddr_in *sin; | |
115 | ||
116 | sc->sc_if.if_unit = ui->ui_unit; | |
117 | sc->sc_if.if_name = "pcl"; | |
118 | sc->sc_if.if_mtu = PCLMTU; | |
119 | /* copy network addr from flags long */ | |
120 | sc->sc_if.if_net = in_netof(htonl(ui->ui_flags)); | |
121 | sc->sc_if.if_host[0] = in_lnaof(htonl(ui->ui_flags)); | |
122 | ||
123 | sin = (struct sockaddr_in *)&sc->sc_if.if_addr; | |
124 | sin->sin_family = AF_INET; | |
125 | sin->sin_addr.s_addr = htonl(ui->ui_flags); | |
126 | ||
127 | sc->sc_if.if_init = pclinit; | |
128 | sc->sc_if.if_output = pcloutput; | |
129 | sc->sc_if.if_reset = pclreset; | |
130 | sc->sc_ifuba.ifu_flags = UBA_NEEDBDP; | |
131 | if_attach(&sc->sc_if); | |
132 | } | |
133 | ||
134 | /* | |
135 | * Reset of interface after UNIBUS reset. | |
136 | * If interface is on specified uba, reset its state. | |
137 | */ | |
138 | pclreset(unit, uban) | |
139 | int unit, uban; | |
140 | { | |
141 | register struct uba_device *ui; | |
142 | ||
143 | if (unit >= NPCL || (ui = pclinfo[unit]) == 0 || ui->ui_alive == 0 || | |
144 | ui->ui_ubanum != uban) | |
145 | return; | |
146 | printf(" pcl%d", unit); | |
147 | pclinit(unit); | |
148 | } | |
149 | ||
150 | /* | |
151 | * Initialization of interface; clear recorded pending | |
152 | * operations, and reinitialize UNIBUS usage. | |
153 | */ | |
154 | pclinit(unit) | |
155 | int unit; | |
156 | { | |
157 | register struct pcl_softc *sc = &pcl_softc[unit]; | |
158 | register struct uba_device *ui = pclinfo[unit]; | |
159 | register struct pcldevice *addr; | |
160 | int s; | |
161 | ||
162 | if (if_ubainit(&sc->sc_ifuba, ui->ui_ubanum, 0, | |
163 | (int)btoc(PCLMTU)) == 0) { | |
164 | printf("pcl%d: can't init\n", unit); | |
165 | sc->sc_if.if_flags &= ~IFF_UP; | |
166 | return; | |
167 | } | |
168 | addr = (struct pcldevice *)ui->ui_addr; | |
169 | addr->pcl_rcr = PCL_RCINIT; | |
170 | addr->pcl_tcr = PCL_TXINIT; | |
171 | ||
172 | /* | |
173 | * Hang a receive and start any | |
174 | * pending writes by faking a transmit complete. | |
175 | */ | |
176 | s = splimp(); | |
177 | addr->pcl_rdba = (short) sc->sc_ifuba.ifu_r.ifrw_info; | |
178 | addr->pcl_rdbc = -PCLMTU; | |
179 | addr->pcl_rcr = (((int)(sc->sc_ifuba.ifu_r.ifrw_info>>12))&0x0030) | | |
180 | PCL_RCNPR | PCL_RCVWD | PCL_RCVDAT | PCL_IE; | |
181 | sc->sc_oactive = 0; | |
182 | sc->sc_if.if_flags |= IFF_UP; /* Mark interface up */ | |
183 | pclstart(unit); | |
184 | splx(s); | |
185 | /* Set up routing table entry */ | |
186 | if_rtinit(&sc->sc_if, RTF_UP); | |
187 | } | |
188 | ||
189 | /* | |
190 | * PCL output routine. | |
191 | */ | |
192 | pcloutput(ifp, m, dst) | |
193 | struct ifnet *ifp; | |
194 | struct mbuf *m; | |
195 | struct sockaddr *dst; | |
196 | { | |
197 | int type, dest, s, error; | |
198 | struct pcl_header *pclp; | |
199 | struct mbuf *m2; | |
200 | ||
201 | switch (dst->sa_family) { | |
202 | ||
203 | #ifdef INET | |
204 | case AF_INET: | |
205 | dest = ((struct sockaddr_in *)dst)->sin_addr.s_addr; | |
206 | dest = ntohl(dest); /* ??? */ | |
207 | dest = dest & 0xff; | |
208 | break; | |
209 | #endif | |
210 | default: | |
211 | printf("pcl%d: can't handle af%d\n", ifp->if_unit, | |
212 | dst->sa_family); | |
213 | error = EAFNOSUPPORT; | |
214 | goto bad; | |
215 | } | |
216 | ||
217 | /* | |
218 | * Add pseudo local net header. | |
219 | * Actually, it does not get transmitted, but merely stripped | |
220 | * off and used by the START routine to route the packet. | |
221 | * If no space in first mbuf, allocate another. | |
222 | */ | |
223 | if (m->m_off > MMAXOFF || | |
224 | MMINOFF + sizeof (struct pcl_header) > m->m_off) { | |
225 | m2 = m_get(M_DONTWAIT, MT_HEADER); | |
226 | if (m2 == 0) { | |
227 | error = ENOBUFS; | |
228 | goto bad; | |
229 | } | |
230 | m2->m_next = m; | |
231 | m2->m_off = MMINOFF; | |
232 | m2->m_len = sizeof (struct pcl_header); | |
233 | m = m2; | |
234 | } else { | |
235 | m->m_off -= sizeof (struct pcl_header); | |
236 | m->m_len += sizeof (struct pcl_header); | |
237 | } | |
238 | pclp = mtod(m, struct pcl_header *); | |
239 | pclp->pcl_dest = dest; | |
240 | ||
241 | /* | |
242 | * Queue message on interface, and start output if interface | |
243 | * not yet active. | |
244 | */ | |
245 | s = splimp(); | |
246 | if (IF_QFULL(&ifp->if_snd)) { | |
247 | IF_DROP(&ifp->if_snd); | |
248 | error = ENOBUFS; | |
249 | goto qfull; | |
250 | } | |
251 | IF_ENQUEUE(&ifp->if_snd, m); | |
252 | if (pcl_softc[ifp->if_unit].sc_oactive == 0) | |
253 | pclstart(ifp->if_unit); | |
254 | splx(s); | |
255 | return (0); | |
256 | qfull: | |
257 | splx(s); | |
258 | bad: | |
259 | m_freem(m); | |
260 | return (error); | |
261 | } | |
262 | ||
263 | /* | |
264 | * Start or restart output on interface. | |
265 | * If interface is already active, then this is a retransmit. | |
266 | * If interface is not already active, get another datagram | |
267 | * to send off of the interface queue, and map it to the interface | |
268 | * before starting the output. | |
269 | */ | |
270 | pclstart(dev) | |
271 | dev_t dev; | |
272 | { | |
273 | int unit = PCLUNIT(dev); | |
274 | struct uba_device *ui = pclinfo[unit]; | |
275 | register struct pcl_softc *sc = &pcl_softc[unit]; | |
276 | register struct pcldevice *addr; | |
277 | struct mbuf *m; | |
278 | ||
279 | if (sc->sc_oactive) | |
280 | goto restart; | |
281 | ||
282 | /* | |
283 | * Not already active: dequeue another request | |
284 | * and map it to the UNIBUS. If no more requests, | |
285 | * just return. | |
286 | */ | |
287 | IF_DEQUEUE(&sc->sc_if.if_snd, m); | |
288 | if (m == 0) { | |
289 | sc->sc_oactive = 0; | |
290 | return; | |
291 | } | |
292 | ||
293 | /* | |
294 | * Pull destination node out of pseudo-local net header. | |
295 | * remove it from outbound data. | |
296 | * Note that if_wubaput calls m_bcopy, which is prepared for | |
297 | * m_len to be 0 in the first mbuf in the chain. | |
298 | */ | |
299 | sc->sc_odest = mtod(m, struct pcl_header *)->pcl_dest; | |
300 | m->m_off += sizeof (struct pcl_header); | |
301 | m->m_len -= sizeof (struct pcl_header); | |
302 | ||
303 | /* Map out to the DMA area */ | |
304 | sc->sc_olen = if_wubaput(&sc->sc_ifuba, m); | |
305 | ||
306 | restart: | |
307 | /* | |
308 | * Have request mapped to UNIBUS for transmission. | |
309 | * Purge any stale data from this BDP, and start the otput. | |
310 | */ | |
311 | if (sc->sc_ifuba.ifu_flags & UBA_NEEDBDP) | |
312 | UBAPURGE(sc->sc_ifuba.ifu_uba, sc->sc_ifuba.ifu_w.ifrw_bdp); | |
313 | addr = (struct pcldevice *)ui->ui_addr; | |
314 | addr->pcl_tcr = PCL_TXINIT; | |
315 | addr->pcl_tsba = (int)sc->sc_ifuba.ifu_w.ifrw_info; | |
316 | addr->pcl_tsbc = -sc->sc_olen; | |
317 | ||
318 | /* | |
319 | * RIB (retry if busy) is used on the second and subsequent packets | |
320 | * to a single host, because TCP often wants to transmit multiple | |
321 | * buffers in a row, | |
322 | * and if they are all going to the same place, the second and | |
323 | * subsequent ones may be lost due to receiver not ready again yet. | |
324 | * This can cause serious problems, because the TCP will resend the | |
325 | * whole window, which just repeats the problem. The result is that | |
326 | * a perfectly good link appears not to work unless we take steps here. | |
327 | */ | |
328 | addr->pcl_tcr = (((int)(sc->sc_ifuba.ifu_w.ifrw_info>>12))&0x0030) | | |
329 | ((sc->sc_odest & 0xF)<<8) | | |
330 | PCL_TXNPR | PCL_SNDWD | PCL_STTXM | PCL_IE | | |
331 | (sc->sc_odest == sc->sc_lastdest ? PCL_RIB : 0); | |
332 | sc->sc_lastdest = sc->sc_odest; | |
333 | sc->sc_oactive = 1; | |
334 | } | |
335 | ||
336 | /* | |
337 | * PCL transmitter interrupt. | |
338 | * Start another output if more data to send. | |
339 | */ | |
340 | pclxint(unit) | |
341 | int unit; | |
342 | { | |
343 | register struct uba_device *ui = pclinfo[unit]; | |
344 | register struct pcl_softc *sc = &pcl_softc[unit]; | |
345 | register struct pcldevice *addr = (struct pcldevice *)ui->ui_addr; | |
346 | ||
347 | if (sc->sc_oactive == 0) { | |
348 | printf ("pcl%d: stray interrupt\n", unit); | |
349 | return; | |
350 | } | |
351 | if (addr->pcl_tsr & PCL_ERR) { | |
352 | sc->sc_lastdest = 0; /* don't bother with RIB */ | |
353 | if (addr->pcl_tsr & PCL_MSTDWN) { | |
354 | addr->pcl_tmmr = PCL_MASTER|PCL_AUTOADDR; | |
355 | pclstart(unit); /* Retry */ | |
356 | printf("pcl%d: master\n", unit ); | |
357 | return; | |
358 | } | |
359 | if (addr->pcl_tsr & PCL_RESPB) { | |
360 | /* Log as an error */ | |
361 | printf("pcl%d: send error, tcr=%b tsr=%b\n", | |
362 | unit, addr->pcl_tcr, PCL_TCSRBITS, | |
363 | addr->pcl_tsr, PCL_TERRBITS); | |
364 | sc->sc_if.if_oerrors++; | |
365 | } | |
366 | } else | |
367 | sc->sc_if.if_opackets++; | |
368 | sc->sc_oactive = 0; | |
369 | if (sc->sc_ifuba.ifu_xtofree) { | |
370 | m_freem(sc->sc_ifuba.ifu_xtofree); | |
371 | sc->sc_ifuba.ifu_xtofree = 0; | |
372 | } | |
373 | pclstart(unit); | |
374 | } | |
375 | ||
376 | /* | |
377 | * PCL interface receiver interrupt. | |
378 | * If input error just drop packet. | |
379 | */ | |
380 | pclrint(unit) | |
381 | int unit; | |
382 | { | |
383 | register struct pcl_softc *sc = &pcl_softc[unit]; | |
384 | struct pcldevice *addr = (struct pcldevice *)pclinfo[unit]->ui_addr; | |
385 | struct mbuf *m; | |
386 | int len, plen; short resid; | |
387 | register struct ifqueue *inq; | |
388 | int off; | |
389 | ||
390 | sc->sc_if.if_ipackets++; | |
391 | /* | |
392 | * Purge BDP; drop if input error indicated. | |
393 | */ | |
394 | if (sc->sc_ifuba.ifu_flags & UBA_NEEDBDP) | |
395 | UBAPURGE(sc->sc_ifuba.ifu_uba, sc->sc_ifuba.ifu_r.ifrw_bdp); | |
396 | if (addr->pcl_rsr & PCL_ERR) { | |
397 | printf("pcl%d: rcv error, rcr=%b rsr=%b\n", | |
398 | unit, addr->pcl_rcr, PCL_RCSRBITS, | |
399 | addr->pcl_rsr, PCL_RERRBITS); | |
400 | sc->sc_if.if_ierrors++; | |
401 | goto setup; | |
402 | } | |
403 | len = PCLMTU + addr->pcl_rdbc; | |
404 | if (len <= 0 || len > PCLMTU) { | |
405 | printf("pcl%d: bad len=%d.\n", unit, len); | |
406 | sc->sc_if.if_ierrors++; | |
407 | goto setup; | |
408 | } | |
409 | ||
410 | /* Really short packets will be part of the startup sequence */ | |
411 | if (len <= 4) { | |
412 | /* Later, do comming-up processing here */ | |
413 | goto setup; /* drop packet */ | |
414 | } | |
415 | ||
416 | /* | |
417 | * Pull packet off interface. | |
418 | */ | |
419 | m = if_rubaget(&sc->sc_ifuba, len, 0); | |
420 | if (m == 0) | |
421 | goto setup; | |
422 | ||
423 | schednetisr(NETISR_IP); | |
424 | inq = &ipintrq; | |
425 | ||
426 | if (IF_QFULL(inq)) { | |
427 | IF_DROP(inq); | |
428 | m_freem(m); | |
429 | } else | |
430 | IF_ENQUEUE(inq, m); | |
431 | setup: | |
432 | /* | |
433 | * Reset for next packet. | |
434 | */ | |
435 | addr->pcl_rcr = PCL_RCINIT; | |
436 | addr->pcl_rdba = (int)sc->sc_ifuba.ifu_r.ifrw_info; | |
437 | addr->pcl_rdbc = -PCLMTU; | |
438 | addr->pcl_rcr = (((int)(sc->sc_ifuba.ifu_w.ifrw_info>>12))&0x0030) | | |
439 | PCL_RCNPR | PCL_RCVWD | PCL_RCVDAT | PCL_IE; | |
440 | } | |
441 | #endif |